diff --git a/lib/pidfile.c b/lib/pidfile.c
index a26de73..886a29c 100644
--- a/lib/pidfile.c
+++ b/lib/pidfile.c
@@ -31,7 +31,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define _GNU_SOURCE		/* Needed with GLIBC to get asprintf() */
 #include <sys/stat.h>		/* utimensat() */
 #include <sys/time.h>		/* utimensat() on *BSD */
 #include <sys/types.h>
diff --git a/src/Makefile.am b/src/Makefile.am
index 9b80a02..1909ada 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -36,7 +36,7 @@ endif
 AM_CFLAGS             = -W -Wall -Wextra
 AM_CFLAGS            += -Wno-unused-result -Wno-unused-parameter -fno-strict-aliasing
 AM_CPPFLAGS           = -DSYSCONFDIR=\"@sysconfdir@\" -DRUNSTATEDIR=\"@runstatedir@\"
-AM_CPPFLAGS          += -D_BSD_SOURCE -D_DEFAULT_SOURCE
+AM_CPPFLAGS          += -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_GNU_SOURCE
 
 syslogd_SOURCES       = syslogd.c syslogd.h socket.c socket.h syslog.h
 syslogd_SOURCES      += timer.c timer.h queue.h compat.h